This seems important enough to fix in Yakkety. Could you do that
Michael?
** Also affects: deja-dup (Ubuntu Yakkety)
Importance: Undecided
Status: New
** Changed in: deja-dup (Ubuntu Yakkety)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/918489
Title:
duplicity allows bad passphrase on full backup if archive cache exists
Status in Déjà Dup:
Fix Released
Status in Duplicity:
New
Status in deja-dup package in Ubuntu:
Fix Released
Status in deja-dup source package in Xenial:
Fix Committed
Status in deja-dup source package in Yakkety:
Triaged
Bug description:
when doing a backup for the first time, dejadup verifies your
passphrase by having you enter it twice.
on future incremental backups it doesn't need to do this because
entering the wrong password will result in the backup failing.
with the periodic 'full' backups that happen from time to time,
however, any password will be accepted.
this can lead to a situation where you accidentally type the wrong
password once and are left in a situation where you don't know what
you typed and have no way to get your files (or do another incremental
backup on top of it).
i think this is what happened to me recently.
clearly, the fix is to explicitly verify the passphrase is correct
when doing a new full backup. this may be a duplicity bug.
=== Ubuntu deja-dup SRU information ===
[impact]
Users may unwittingly re-set their backup password and not be able to restore
their data.
[test case]
- $ deja-dup-preferences # set up a dummy backup
- $ deja-dup --backup # complete first encrypted full backup
- $ rename 's/\.2016/\.2000/' /path/to/test/backup/*
- $ rename 's/\.2016/\.2000/' ~/.cache/deja-dup/*/*
- $ deja-dup --backup # second backup, enter the wrong password
- $ deja-dup --restore # try to restore with original password
[regression potential]
Should be limited? The fix is to delete the duplicity cache files, which
ought to be safe to delete.
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